This article lists some common problems so that you can easily solve them.

CSS rendering incorrectly§

Purge CSS

The problem probably due to the postcss, HBS need the following configuration to be set up, postcss rely on the file hugo_stats.json for purging unused CSS.

1[build]
2  writeStats = true

js.Build: Could not resolve dependencies§

 1Start building sites … 
 2hugo v0.94.0-63B23660+extended linux/amd64 BuildDate=2022-03-10T09:46:36Z VendorInfo=gohugoio
 3ERROR 2022/03/19 14:03:50 js.Build failed: Could not resolve "bootstrap/js/src/offcanvas"
 4ERROR 2022/03/19 14:03:50 js.Build failed: Could not resolve "bootstrap/js/src/modal"
 5ERROR 2022/03/19 14:03:50 js.Build failed: Could not resolve "bootstrap/js/src/tab"
 6ERROR 2022/03/19 14:03:50 js.Build failed: "/home/razonyang/Projects/razonyang/hugo-theme-bootstrap/assets/js/collapse/collapse.ts:1:38": Could not resolve "bootstrap/js/src/collapse"
 7ERROR 2022/03/19 14:03:50 js.Build failed: "/home/razonyang/Projects/razonyang/hugo-theme-bootstrap/assets/js/toc/index.ts:1:27": Could not resolve "bootstrap/js/dist/offcanvas"
 8ERROR 2022/03/19 14:03:50 js.Build failed: Could not resolve "@fortawesome/free-solid-svg-icons"
 9ERROR 2022/03/19 14:03:50 js.Build failed: Could not resolve "@fortawesome/free-regular-svg-icons"
10ERROR 2022/03/19 14:03:50 js.Build failed: Could not resolve "@fortawesome/free-brands-svg-icons"
11ERROR 2022/03/19 14:03:50 js.Build failed: Could not resolve "workbox-routing"
12ERROR 2022/03/19 14:03:50 js.Build failed: Could not resolve "workbox-strategies"
13ERROR 2022/03/19 14:03:50 js.Build failed: Could not resolve "workbox-cacheable-response"
14ERROR 2022/03/19 14:03:50 js.Build failed: Could not resolve "workbox-expiration"
15ERROR 2022/03/19 14:03:50 js.Build failed: Could not resolve "workbox-precaching"
16ERROR 2022/03/19 14:03:50 js.Build failed: "/home/razonyang/Projects/razonyang/hugo-theme-bootstrap/assets/search/search.ts:1:21": Could not resolve "mustache"
17ERROR 2022/03/19 14:03:50 js.Build failed: "/home/razonyang/Projects/razonyang/hugo-theme-bootstrap/assets/search/search.ts:1:17": Could not resolve "mark.js/dist/mark.js"
18ERROR 2022/03/19 14:03:50 js.Build failed: Could not resolve "bootstrap/js/src/offcanvas"
19ERROR 2022/03/19 14:03:50 js.Build failed: Could not resolve "bootstrap/js/src/modal"
20ERROR 2022/03/19 14:03:50 js.Build failed: Could not resolve "bootstrap/js/src/tab"
21ERROR 2022/03/19 14:03:50 js.Build failed: "/home/razonyang/Projects/razonyang/hugo-theme-bootstrap/assets/js/collapse/collapse.ts:1:38": Could not resolve "bootstrap/js/src/collapse"
22ERROR 2022/03/19 14:03:50 js.Build failed: "/home/razonyang/Projects/razonyang/hugo-theme-bootstrap/assets/js/toc/index.ts:1:27": Could not resolve "bootstrap/js/dist/offcanvas"
23ERROR 2022/03/19 14:03:50 js.Build failed: Could not resolve "bootstrap/js/src/offcanvas"
24ERROR 2022/03/19 14:03:50 js.Build failed: Could not resolve "bootstrap/js/src/modal"
25ERROR 2022/03/19 14:03:50 js.Build failed: Could not resolve "bootstrap/js/src/tab"
26ERROR 2022/03/19 14:03:50 js.Build failed: "/home/razonyang/Projects/razonyang/hugo-theme-bootstrap/assets/js/collapse/collapse.ts:1:38": Could not resolve "bootstrap/js/src/collapse"
27ERROR 2022/03/19 14:03:50 js.Build failed: "/home/razonyang/Projects/razonyang/hugo-theme-bootstrap/assets/js/toc/index.ts:1:27": Could not resolve "bootstrap/js/dist/offcanvas"
28ERROR 2022/03/19 14:03:51 js.Build failed: Could not resolve "bootstrap/js/src/offcanvas"
29ERROR 2022/03/19 14:03:51 js.Build failed: Could not resolve "bootstrap/js/src/modal"
30ERROR 2022/03/19 14:03:51 js.Build failed: Could not resolve "bootstrap/js/src/tab"
31ERROR 2022/03/19 14:03:51 js.Build failed: "/home/razonyang/Projects/razonyang/hugo-theme-bootstrap/assets/js/collapse/collapse.ts:1:38": Could not resolve "bootstrap/js/src/collapse"
32ERROR 2022/03/19 14:03:51 js.Build failed: "/home/razonyang/Projects/razonyang/hugo-theme-bootstrap/assets/js/toc/index.ts:1:27": Could not resolve "bootstrap/js/dist/offcanvas"
33ERROR 2022/03/19 14:03:51 TOCSS: failed to transform "viewer/scss/index.scss" (text/x-scss): SCSS processing failed: file "stdin", line 1, col 1: File to import not found or unreadable: viewerjs/dist/viewer. 
34ERROR 2022/03/19 14:03:51 JSBUILD: failed to transform "main/js/bundle.ts" (application/typescript): Could not resolve "bootstrap/js/src/dropdown"
35ERROR 2022/03/19 14:03:51 JSBUILD: failed to transform "icons/index.js" (application/javascript): Could not resolve "@fortawesome/fontawesome-svg-core"
36ERROR 2022/03/19 14:03:51 JSBUILD: failed to transform "service-worker/bundle.ts" (application/typescript): Could not resolve "workbox-core"
37ERROR 2022/03/19 14:03:51 JSBUILD: failed to transform "viewer/js/index.ts" (application/typescript): Could not resolve "viewerjs"
38Error: Error building site: JSBUILD: failed to transform "search/index.ts" (application/typescript): "/home/razonyang/Projects/razonyang/hugo-theme-bootstrap/assets/search/search.ts:1:17": Could not resolve "fuse.js"

It is due to the lack of CSS and JS dependencies:

1$ hugo mod npm pack
2$ npm install
3$ hugo server